Im toying with the idea of putting something fast/big/hard etc on my gwp, the bitch has made the grade on quarry from birds, to hares, good hunt, point and retrieve, stalking and bloodtrailing, foxing, bushing rabbits, and some boar hunting. She is one the best hunting dogs Ive had, and the most versatile. It would have to be some dog though, and fast, but I could never put a greyhound over her, as Id need better endurance and better feet/coat in the pups.